Young Justice (1998) Comic

Superboy, Impulse and Robin are all having a camp-out at the old Justice League headquarters. They manage to make such a mess that they wake up the Red Tornado who has lied in a comatose state for years until they inadvertently woke him up. After a brief conversation they get a message that comes through on the monitor and when it does Impulse jumps them through into a new adventure that gives them their name and uncovers their first villain and the Super-Cycle.